How do I split these guys up?

[Bighead]

I have a 100 reptarium on it's flat side that my pair of beardies share. It is 48" x 30" x 18". I need to seperate them because the female is looking a little depressed and staying away from the male on one side of the cage all the time now. I also should seperate them to prepare for breeding in the spring. What would be a good way to divide the cage in half? For those of you who aren't familiar with reptariums, they are the ones that have a small pvc frame with a nylon mesh covering and zippered opening. Any ideas would be great.
Thanks

[chamitch]

anythign woudl do man. cardboard. MDF. but the best things woudl be tottaly seperate cagess